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Epistasis: describes a relationship between two mutantplugin-autotooltip__default plugin-autotooltip_bigMutant: an individual that has a different phenotype than wildtype and likely contains one more mutations that cause this difference. allelesplugin-autotooltip__default plugin-autotooltip_bigAllele: a version of a gene. Alleles of a gene are different if they have differences in their DNA sequence. $a$ and $b$. If the phenotypeplugin-autotooltip__default plugin-autotooltip_bigPhenotype: an observable feature or property of an organism. of a double mutantplugin-autotooltip__default plugin-autotooltip_bigMutant: an individual that has a different phenotype than wildtype and likely contains one more mutations that cause this difference. $a$ \cdot b$ is the same as the single mutant $a$ we say that $a$ is epistatic to $b$, and that $a$ likely functions after $b$ in a pathwayplugin-autotooltip__default plugin-autotooltip_bigPathway: a series of reactions or events that occur in sequence with some common goal or purpose..